How do I edit another users contact custom field?

How do I edit another users contact custom field?

In Zoho Campaigns (not Campaigns in Zoho CRM) I can only create and edit my own contact custom fields. I expect all contact custom fields to be editable by all admins.

I have another admin who has created custom fields and I would like to add another option to a multi-select custom field. If that admin leaves the company how would I edit those fields?

Thanks for your help,